<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input type="text" placeholder="员工姓名" id="i1">
<input type="text" placeholder="员工工资" id="i2"><br>
<input type="text" placeholder="员工工作" id="i3">
<input type="button" value="添加" onclick="f()">
<table border="1">
  <caption>员工列表</caption>
  <tr>
    <th>姓名</th>
    <th>工资</th>
    <th>工作</th>
  </tr>
</table>
<script>
  let i1=document.querySelector("#i1");
  let i2=document.querySelector("#i2");
  let i3=document.querySelector("#i3");
  let table=document.querySelector("table");
  function f() {
    let tr=document.createElement("tr");
    let nameTd=document.createElement("td");
    let salaryTd=document.createElement("td");
    let jobTd=document.createElement("td");
      nameTd.innerText= i1.value  ;
      salaryTd.innerText= i2.value ;
      jobTd.innerText=i3.value ;
      //把td装进tr
      tr.append(nameTd,salaryTd,jobTd);
      //把tr装进table
      table.append(tr);
  }
</script>
</body>
</html>